neutral boundary condition needed

Bernd

Hi fellow Fluent-Users,

I'm trying to simulate an incompressible streamwise flow along an unbounded corner in order to view the behaviour of the boundary layer in the corner.

For this, I use a cubical domain with a velocity inlet, 2 walls (on the left and on the bottom) and 3 pressure outlets (on the right, on top and at the exit).

My problem is that the pressure outlet boundary has an impact too big on the interiors. No matter how I scaled the cubicle, the isovels would still extend up tho the lateral outlets, which can't be right because there should be a free unidirectional flow. Have a look at this: http://img76.imageshack.us/img76/882...n3xpresed0.jpg

That's why I'm desperately looking for a way to use a kind of neutral boundary layer that puts no forces on the fluid an just lets it travel through without having an effect on it, as already described in this thread: http://www.cfd-online.com/Forum/flue...cgi?read=47598

Could I do this with the help of a UDF?

I'm thankful for any helping answers!